B08_Att_1_SOW_140P8625Q0069.pdf

SCOPE OF WORK

SAN FRANCISCO MARITIME NATIONAL HISTORICAL PARK

Seal Cracks and Apply Sealcoat to Asphalt Paving in Aquatic Park

July 2025

PART 1: GENERAL

1.1 DESCRIPTION

This project is required to seal cracks and apply a sealcoat to asphalt sections in Aquatic Park. The intent of this project is to extend the service life of the current paving and provide a safe and orderly walking surface for the general public in this urban park.

This work includes all purchases, delivery, labor, demolition/disposal, installation/construction and allied efforts in accordance with this document. Along with this document is a general site map indicating the areas to be improved.

The day-to-day operations and public use within the park will continue during this work. The contractor shall use adequate fencing/barriers to keep the public and employees safe from work activities and to keep public out of these areas until work is complete. This work is to be performed by a contractor licensed in the state of California with a specialty license in asphalt paving (such a C-12 or C-32).

1.2 GENERAL CONDITIONS AND INFORMATION

A. Aquatic Park is owned by the Department of the Interior, and its agency the National Park

Service (NPS), and is maintained by San Francisco Maritime National Historical Park (SAFR).

Care must be taken to protect the historic fabric that is adjacent to all work sites. Any damage to the historic fabric will be repaired/replaced in-kind and at the Contractor’s expense.

B. The specifications described in this document or any indicated attachment, are given for guidance to the Contractor. However, the Contractor is to take his or her own measurements, dimensions and counts to perform all work indicated, and are responsible for the same.

C. All work described in this specification shall be accomplished in accordance with the provisions of the NPS Contract, Scope of Work and specifications. Additional work that will result in additional cost shall be carried out only when authorized in writing by the Contracting Officer.

D. On a daily basis, the Contractor shall be responsible for removing and disposing of any debris from the work areas of Park that is generated by the Contractor.

E. All disturbed surfaces shall be cleaned and restored to the original appearance by the Contractor.

F. The Contractor shall immediately notify the Contracting Officer of any ambiguities, inconsistencies and errors discovered in this specification or between contracting documents and existing conditions.

G. The Contractor shall be responsible for locating all existing infrastructure relative to work site

(including water, gas and electric) prior to the start of work. In addition, contractor is responsible to request and underground service alert via USA North.

RFQ 140P8625Q0069 Seal Cracks & Apply Sealcoat – Aquatic Park

Attachment 1 Scope of Work San Francisco Maritime National Historical Park

H. The contractor is responsible for all aspects of public safety relative to this work and must employ traffic devices and signage to make the area safe for workers, park staff and park visitors.

Signage must be posted at a distance relative to the worksite to safely and smoothly detour all traffic in an orderly fashion away from the work site. The signage should not be posted in a manner that does not provide enough warning for oncoming traffic to safely discern the detoured route.

I. Care shall be taken to avoid spraying fogseal on Barbary Coast Monuments and surrounding concrete.

PART 2: SCOPE OF WORK/ SERVICES, ADDITIONAL REQUIREMENTS,

CLARIFICATIONS AND INFORMATION

2.1 SCOPE OF WORK/SERVICES

The Contractor must field verify all new and existing dimensions indicated in this contract, work site(s), specifications, and the indicated attachments before ordering materials and/or performing work.

This project is required to seal cracks and apply a fog seal to asphalt sections in Aquatic Park. These areas measure approximately 45,000 square feet. The contractor will also repair paving and subgrade to one hundred square feet of settled/collapsed paving as designated on site map. Contractor is responsible to measure the area as indicated on the attached map. Contractor is also responsible to verify with Contracting Officer’s Representative of cracks to be sealed.

Contractor shall include a site map to provide visual of work area, closures, placement of traffic barriers/devices/signage and duration of these. Staging and fencing must be included, although may be different from site map. This is to be provided as a submittal after solicitation but before the Notice to

Proceed is issued.

Contractor may be required to fill out and provide a hot work permit. Park shall provide the hot work form. This is to be provided as a submittal after solicitation but before the Notice to Proceed is issued.

This work includes all purchases, delivery, labor, demolition/disposal, installation/construction, and allied efforts in accordance with this document. Along with this document is a general site map indicating the areas to be improved.

Contractor shall perform all surface preparation, crack sealing, fog seal application and repair in line with excerpts provided in the specifications below and as listed in the “Standard Specifications for

Construction of Roads and Bridges on Federal Highway Projects, FP-24, UNITED STATES DEPARTMENT OF TRANSPORTATION Federal Highway Administration”. This document can be viewed online in its entirety. https://highways.dot.gov/federal-lands/specs

2.1.1 ASPHALT PAVEMENT CRACK SEALING AND FILLING

Description

2.1.1.01 This work consists of routing, cleaning, sealing, and filling cracks in asphalt pavement surfaces.

https://highways.dot.gov/federal-lands/specs

Material

2.1.1.02 Conform to the following Section and Subsection:

Asphalt concrete 403

Joint sealants and crack fillers (hot applied) 712.01(a)

Construction Requirements

2.1.1.03 Equipment. Furnish equipment with the following capabilities:

(a) Router. A power rotary impact router or vertical spindle router capable of creating a reservoir to the required depth and width without damaging adjacent pavement.

(b) Air lance. A hot compressed air lance capable of providing clean, oil-free compressed air at a volume of 100 cubic feet (2.8 cubic meters) per minute, a pressure of 120 pounds per square inch (830 kilopascals), and a temperature of 2000 °F (1100 °C).

(c) Application wand. A wand attached to a heated hose attached to a heated material chamber that maintains material temperature within manufacturer’s tolerances. Supply proper wand tips for desired application.

(d) Heating kettle. An indirect-heating double boiler capable of constant and effective agitation. Fill the space between the inner and outer shells with oil or other heat transfer medium. Provide an accurate and calibrated thermometer with a range from 200 to 600 °F in 5 °F graduations (90 to 320 °C in 2 °C graduations) located so the material temperature can be safely checked.

(e) Squeegee or screed. A hand-held squeegee or screed of appropriate configuration for filling cracks flush with the surface, underfilling cracks to recess below the surface, or overfilling cracks to an overband shape.

(f) Compressor. A compressor capable of producing oil- and water-free air at a minimum rate of 100 cubic feet (2.8 cubic meters) per minute with a minimum continuous line pressure of 125 pounds per square inch (860 kilopascals).

2.1.1.04 Routing. Rout, clean, and seal cracks in a continuous operation. Do not allow traffic to close or damage routed cracks.

Rout ⅛- to ½-inch (3- to 13-millimeter) wide cracks to produce vertical, intact walls and a flat bottom with a reservoir centered over the crack. Make the reservoir two to three times the width of the crack.

Rout cracks to a depth of ½ to ¾ inches (13 to 19 millimeters).Section 414 351

2.1.1.05 Cleaning. Prevent debris from entering waterways, travel lanes open to public traffic, or areas designated not to be disturbed. Remove dirt, dust, and other deleterious material from the crack walls and cavity using a stream of air or other approved methods. Blow or brush dry material off the pavement surface.

2.1.1.06 Sealing and Filling. Dry the crack surfaces with the hot air lance before sealing or filling. Do not seal or fill cracks when the pavement surface temperature is below 35 °F (2 °C) and weather conditions are rainy or foggy.

(a) Sealing (routed cracks or cracks averaging ¼ to 1 inch (6 to 25 millimeters) wide). Submit a copy of and adhere to the manufacturer’s recommendations for heating and applying the hot applied crack material. Heat the material to pouring temperature in a heating kettle and continuously agitate the material.

Discard sealant when:

(1) Heated above the safe heating temperature recommended by the manufacturer;

(2) Held at pouring temperature for more than 12 hours;

(3) Reheated more than once; or

(4) Not consistent or uniform in appearance.

Warm and dry the crack surfaces using a hot-compressed air lance if the pavement temperature is lower than 50 °F (10 °C) or moisture is present. Keep the lance moving to prevent burning the pavement surface. Place and finish the material within 5 minutes after heating the pavement surface with the lance.

Use an application wand to place material in each crack from the bottom up. Insulate the wand to maintain pouring temperature while placing material. Return the wand to the heating kettle immediately after sealing each crack. Use a squeegee or screed to strike off the material.

(b) Filling (cracks averaging more than 1 inch (25 millimeters) wide). Fill each crack with an asphalt mix according to Section 403. Use a squeegee, screed, or other suitable equipment to force the mix into the crack. Fill each crack flush with the pavement surface and compact the asphalt mixture.

Do not allow traffic on sealed or filled cracks until the sealant or filler has cured or is treated with debonding material recommended by the manufacturer and approved by the CO.

2.1.1.07 Resealing Cracks. Reseal cracks exhibiting adhesion failure, damage, incomplete filling, foreign objects in the sealant, or otherwise rejected by the CO

Existing material: All asphalt material in the areas indicated on the specification documents must be removed and properly disposed of to a three inch depth. Site fixtures and furnishings such as storm drains, lawn mower and planting curbs, and cobblestone paver shall remain intact (accept as noted below). Contractor must consult with Contracting Officer (or COR) before removing /disposing of. Any material other than asphalt and subgrade material must be The total area is approximately 39,000 square feet.

New material: After existing asphalt is removed, subgrade must be compacted to 95% (where possible).

A minimum three inch layer of AC asphalt must then be installed over the compacted subgrade. The finish grade will be at the same level of all adjacent site details such as storm drains, lawn mower and planting curbs, monuments and cobblestone pavers. Finally, a sealcoat must be applied to all new asphalt.

Finish grade will ensure positive drainage to any adjacent storm drains and will grade appropriately to adjacent site details such as storm drains, lawn mower and planting curbs and cobblestone pavers.

Submittal of material is required before it is installed. See further asphalt and seal coat specifications below.

2.1.2 ASPHALT CONCRETE

2.1.2.01 This work consists of constructing asphalt concrete pavement using a hot or warm mix asphalt

(HMA or WMA).

Asphalt concrete type is designated as Type I or Type II according to Subsection 403.02.

2.1.2.02 Composition of Mix (JMF). Conform to current state department of transportation material specifications for asphalt concrete.

(a) Type I. Submit a state department of transportation JMF approved within the past 12 months for approval at least 30 days before production. For each proposed JMF, submit a production certification conforming to state department of transportation specifications and conforming to design parameter (a), (b), or (c) for the type of mix submitted and conforming to design parameter (d) in Table 403-1. Table 403-1

Asphalt Concrete Mix Requirements

Design Parameters

Specification

(a) Volumetric hot asphalt concrete pavement

(AASHTO M 323, AASHTO R 35, and AASHTO T 312) Gyratory compaction level 7, 75, 115

Volumetric properties at 0.3 to 3 million ESAL’s

(AASHTO M 323)

See Table 401-1

(b) Hveem (AASHTO T 246 and AASHTO T 247)

Stabilometer, minimum 35

Percent air voids (1) 3.0 – 5.0

(c) Marshall (AASHTO T 245)

Stability, pounds (kilonewtons), minimum 2000 (8.9) Flow, 0.01 inches (0.25 millimeters) 8 – 14

Percent air voids (1) 3.0 – 5.0

Compaction, number of blows each end of test specimen

(d) Moisture susceptibility (AASHTO T 283)

Tensile strength ratio, minimum 0.80

(1) The percent of air voids are based on AASHTO T 166, AASHTO T 209 and AASHTO T 269.

(b) Type II. Provide a mix composed of crushed stone or gravel and asphalt binder mixed in an approved plant. Use an aggregate gradation and asphalt binder of a quality conforming to those normally used locally by either Federal or state agencies for the type of work being constructed.

Submit the strength, quality, and gradation specifications for the asphalt concrete mix. Include copies of laboratory test reports that demonstrate aggregate, asphalt binder, additive, and mix properties meet Federal, state or local government agency specifications. Section 403 310

For both Type I and Type II, submit the maximum specific gravity (density) of the mix as determined by

AASHTO T 209.

2.1.2.03 Production Start-Up Procedures. See Subsection 153.04(b).

2.1.2.04 Mixing Plant. See Subsection 401.04.

2.1.2.05 Surface Preparation. See Subsection 401.06.

2.1.2.06 Weather Limitations. See Subsection 401.07.

2.1.2.07 Hauling. See Subsection 401.11.

2.1.2.08 Placing and Finishing. Do not use mixes produced from different plants unless the mixes are produced according to the same JMF, use material from the same sources, and are approved.

Place HMA at a temperature conforming to Table 401-2. Place WMA at temperatures conforming to

Subsection 401.03. Measure temperature of the asphalt concrete mix in the hauling vehicle just before dumping into the spreader or measure it in the windrow immediately before pickup.

(a) Asphalt concrete for roadway construction. Place the mix with a paver conforming to Subsection

401.05. Control horizontal alignment using a reference line. Automatically control the grade and slope from reference lines, a ski and slope control device, or dual skis. Use skis having a minimum length of 20 feet (6 meters).

In areas where mechanical spreading and finishing is impractical; place and finish the asphalt concrete mix according to Subsection 403.08(b).

Offset the longitudinal joint according to Subsection 401.13.

(b) Asphalt concrete for non-roadway uses. Spread and finish each course by hand raking, screeding, or by other approved methods.

2.1.2.09 Compacting. Thoroughly and uniformly compact the asphalt surface by rolling. In places inaccessible to rollers, use alternate equipment approved by the CO. Do not cause cracking, shoving or undue displacement.

Monitor the compaction process with nuclear density gauges calibrate according to the ASTM D2950 calibration section within 6 months before use. Check the standard and reference on each day of use according to the ASTM D2950 standardization and reference check sections. Compact to at least 91.0 percent of the maximum specific gravity (density) determined in Subsection 403.02.

Continue compaction until surface marks are eliminated and cracks are sealed.

2.1.2.10 Joints, Trimming Edges, and Cleanup. See Subsection 401.15.

2.1.2.11 Pavement Straightedge Measurement. Measure the pavement surface using a 10-foot (3-meter) metal straightedge at right angles and parallel to the centerline. Defective areas are deviations between the surface and the bottom of the straightedge in excess of ¼ inches (6 millimeters) measured between two contacts of the straightedge or deviations in excess of ¼ inches (6 millimeters) measured at the end of the straightedge. Section 403 311

Correct defective areas according to Subsection 401.16(g)(1) through (4). Obtain approval for the method of correction.

2.1.2.12 Acceptance. See Table 403-2 for sampling, testing, and acceptance requirements.

Asphalt concrete mix properties will be evaluated under Subsection 106.04.

Asphalt binder will be evaluated under Subsection 106.03.

Construction of asphalt concrete work will be evaluated under Subsections 106.02 and 106.04.

Pavement straightedge measurement will be evaluated under Subsection 106

2.1.3 JOINT MATERIAL

2.1.3.01 Sealants, Fillers, and Seals. Conform to the following:

(a) Joint sealants and crack fillers.

(1) Joint and crack sealant, hot-applied, ASTM D6690, Type II or Type III for concrete and asphalt concrete pavements

(2) Crack filler, hot-applied, for concrete ASTM D5078 and asphalt concrete pavements

(3) Proprietary asphalt-rubber products, furnish the following:

(a) Source and grade of asphalt binder;

(b) Total quantity of granulated rubber and mass as a percent of asphalt-rubber mixture;

(c) Granulated rubber types and quantity of each type (if blend);

(1) Mass as a percent of combined rubber; and

(2) Gradation of granulated rubber.

(d) Type of asphalt modifier, if any;

(e) Quantity of asphalt modifier and mass as a percent of asphalt binder;

(f) Other additives;

(g) Heating and application temperatures; and

(h) Manufacturer’s recommended application procedures.

(4) Elastomeric joint sealant ASTM C920, Type M, Grade P, Class 25, Use T1 or T2

(5) Flexible cellular joint filler ASTM D1056, Type 2, Class B or Class C, Grades 3, 4, or 5

2.1.4 FOG SEAL

2.1.4.01 This work consists of applying an emulsified asphalt fog seal.

Emulsified asphalt is designated according to AASHTO M 140 or AASHTO M 208.

Material

2.1.4.02 Conform to the following Subsections:

Blotter 703.12

Emulsified asphalt 702.02 Water 725.01(c)

2.1.4.03 Equipment. Furnish an asphalt distributor with the following:

(a) Heater for uniformly heating the asphalt;

(b) Full circulation spray bar adjustable to 15-foot (4.5-meter) width;

(c) Positive controls including tachometer, pressure gauge, volume measuring device, or calibrated tank to uniformly deposit asphalt over the full width within 0.02 gallons per square yard (0.09 liters per square meter) of the required rate; and

(d) Thermometer for measuring asphalt temperature in the tank.

2.1.4.04 Surface Preparation.

(a) Clean the existing surface of loose material, dirt, and other deleterious material before placing the fog seal. Remove or protect raised pavement markers, pavement markings, reflectorized tape, and other material that interferes with the work. Protect service entrances (such as manholes, valve boxes, and drop inlets). Protect concrete work, rock walls, and other objects adjacent to the work.

(b) Dry the surface before placing the fog seal.

2.1.4.05 Weather Limitations. Apply fog seals only when the following apply:

(a) Ambient air temperature is above 50 °F (10 °C);

(b) Surface temperature is above 50 °F (10 °C);

(c) Weather is not foggy or rainy;

(d) Rain or temperatures below 40 °F (4 °C) are not anticipated for at least 24 hours after application;

Section 406 322

(e) Sustained winds are less than or equal to 10 miles (16 kilometers) per hour; and

(f) Application is completed at least 2 hours before sunset.

2.1.4.06 Asphalt Application. Dilute the emulsion one part water to one part emulsified asphalt.

Apply the emulsion according to Subsection 407.09 at a rate of 0.10 to 0.15 gallons per square yard (0.4 to 0.7 liters per square meter) as approved by the CO.

At locations where the fog seal cannot be applied with an asphalt distributor spray bar, apply the fog seal uniformly using a hand spray attachment or by another approved method.

Allow the fog seal to cure undisturbed for at least 2 hours or until the emulsified asphalt breaks and is substantially tack free.

Cover unabsorbed asphalt with blotter to protect traffic or minimize rain damage. Remove excess blotter after the asphalt is absorbed. Dispose of material according to Subsection 203.05(a) and (d).

2.1.4.07 Blotter. Furnish sound durable particles of gravel or crushed stone conforming to the following:

(a) Material passing ⅜-inch (9.5-mm) sieve, 100 percent

AASHTO T 27

(b) Liquid limit, AASHTO T 89, Method A 25 max.

(c) Without organic matter and clay balls.

2.1.4.08 Emulsified Asphalt. Conform to AASHTO M 140 or AASHTO M 208.

(a) Polymer modified cationic emulsified asphalt for chip seals. Use a solid or latex polymer added either to the asphalt binder or during the emulsification process. Conform to AASHTO M 316, except as follows:

(1) Force ratio, f2/f1, 39.2 °F (4 °C), 5 cm/min, AASHTO T 300 0.3 min.

(2) Elastic recovery, 77 °F (25 °C), 5 cm/min, AASHTO T 301 50 % min.

(3) CRS-2P, penetration, 77 °F (25 °C), 100 g, 5 sec, 90 to 150

AASHTO T 49

(4) CRS-2hP, penetration, 77 °F (25 °C), 100 g, 5 sec, 50 to 90

AASHTO T 49

(b) Polymer-modified emulsified asphalt for micro-surfacing. Conform to ISSA A143, except use Section 6, Emulsified Asphalt Residue by Evaporation of AASHTO T 59 to determine percent residue.

(c) Penetrating emulsified asphalt for prime coat. Conform AASHTO T 59, except as modified by

Table 702-1. Table 702-1

2.1.4.09 Water. Conform to the following:

(c) Water for earthwork, pavement courses, dust control, and incidental construction. Furnish water free of substances detrimental to the work.

DAILY CLEAN UP:

The Contractor shall be responsible for removing and disposing of any debris from the work areas that is generated by the Contractor.

SUBMITTALS

GENERAL DESCRIPTION

The work of this section consists of submittal requirements before and during construction.

RELATED REQUIREMENTS

Closeout submittals - Section 01770.

SUBMITTAL AND APPROVAL PROCEDURES

As specified in the individual sections, forward submittals to Contracting Officer at least 30 days before need for approval. Unless a different number is specified, submit one reproducible original and two copies of each shop drawing, three copies of manufacturer's catalog sheets (cut sheets), three specimens of each sample, and three copies of all other submittals requested.

Samples: Samples shall be large enough to illustrate clearly the functional characteristics and full range of color, texture, or pattern.

Manufacturers' Catalog Sheets: Submit only pertinent pages; mark each copy of standard printed data to identify specific products proposed for use.

Manufacturer's Installation Instructions: When contract documents require compliance with manufacturer's printed instructions, provide one complete set of instructions for Contracting Officer and keep another complete set of instructions at the project site until substantial completion.

PAVEMENT INSTALLATION

PART 1 GENERAL

1.1 DESCRIPTION

A. The work of this section consists of sawcutting, preparing subgrade, installing asphalt base, if required, and placing and compacting hot-mix asphalt at the finishing height and grade of all adjacent site details including, storm drains, lawn mower and planting curbs, monuments and cobblestone pavers.

1.2 WORK LAYOUT

A. See attached map.

PART 2 PRODUCTS

2.1 ASPHALT MIXTURE

A. Use hot-mix asphalt mixture readily available in the area.

PART 3 EXECUTION

3.1 SAWCUTTING ASPHALT

A. Sawcut the existing pavement (where needed) at the locations to create a continuous and smooth transition between the existing and new surfaces.

3.2 EXCAVATION

A. Remove the existing pavement, tree roots (if any), aggregate base course and unsuitable subgrade material to reach support as firm as possible. Shape the walls of the excavation to create a smooth, vertical surfaces. Dry the excavation if it contains excess moisture. Moisten the bottom of the excavation to approximate optimum moisture and compact with a minimum of three passes with a compactor.

3.3 TACK COAT (as needed)

A. Clean the asphalt portion of the excavation walls prior to placing the tack coat.

B. Thoroughly paint or spray the diluted tack coat material on the asphalt walls of the excavation.

SEAL COAT

PART 1 GENERAL 1 .1 DESCRIPTION

A. The Contractor shall seal all designated pathways and renewed areas.

ADDITIONAL REQUIREMENTS, CLARIFICATIONS AND INFORMATION

1. Contractor will be responsible for traffic controls; NPS does will not provide this.

2. The contractor must carefully supervise operations to prevent damage, to buildings, park furnishings, trees, lawns and plants.

3. Contractor shall be responsible for locating and preventing damage to known utilities. If damage occurs, repair utility at no additional expense to the Government.

4. If damage occurs to an unknown utility, repair utility. An equitable adjustment will be made in accordance with the Changes clause of the General Provisions.

5. The Contractor shall work closely with the COR/grounds keeping staff during job layout in order to avoid damaging flower beds, lawns, retaining walls, and irrigation systems.

6. Contractor will provide equipment/tool storage area. This must be off site unless the contractor can and is comfortable with keeping and securing tools within one of the work sites and in manner agreeable to COR/Project Manager.

7. There is no power available on site for the contractors use; provide description of alternative supplies of both for NPS approval with proposal.

8. The contractor shall contact Underground Service Alert (USA North) seven (7) calendar days prior to the start of each ground disturbing phase and shall be responsible for maintaining a valid

USA location tag through the duration of construction. The majority of utilities within the Park are owned by NPS. As such, very few utilities will actually be marked by USA. It is the Contractor’s responsibility to field locates, verify, and mark all utilities within the project area.

Contractor shall be responsible for locating and preventing damage to utilities. If damage occurs, Contractor will repair utility at no additional expense to the Government.

9. A staging and fencing plan is required. The area is highly visited – especially on the weekends.

Public safety for the duration of the project is required. Adequate barriers are required for each area (until each is completed) during the entire project. Do consider all methods to ensure public safety and site protection (i.e., flaggers, construction fencing, barriers and traffic devices).

10. A site-specific health and safety plan is required for NPS review and approval before issuance of the Notice to Proceed.

11. A site visit may be scheduled by the Contracting Officer/Contracting Officer’s Representative.

The Contractor must examine the site and decide for themselves the difficulties to overcome and determine their methods for executing the contract work.

PART 3: INSPECTION / ACCEPTANCE

CLOSE OUT

A. Remove all tools, equipment, surplus, materials, and rubbish from the worksite.

B. Restore or refinish surfaces that are damaged due to work of this contract to original condition.

C. Remove grease, dirt stains, foreign materials, and labels from finished surfaces.

D. Schedule the final inspection with park point-of-contact, Micah Wright. At time of final inspection, project shall be thoroughly clean and ready for use.

PART 4: POINTS OF CONTACT

a. Technical Representative/Submittals and Approvals:

Named at time of award

PART 6:

Attachments

Photo Illustrations

Care shall be taken to avoid spraying fogseal on Barbary Coast Monuments and surrounding concrete.

See next page for site map of asphalt section locations.

Map